What is 4x + (2-1) = if x=9

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

For what type of equity loan are you lent a lump sum, which is to be paid within a certain period of time? a. a line of credit b. equity c. a second mortgage d. an amortization

What is the difference between the equations of a vertical and a horizontal line?